4. had lost
5. had been working / met
6. did you come
7. had been writing
8. was cooking / was trying
9. had been preparing
10. was doing
11. didn't you call / had been waiting
12. visited
4. had lost
5. had been working / met
6. did you come
7. had been writing
8. was cooking / was trying
9. had been preparing
10. was doing
11. didn't you call / had been waiting
12. visited